private void BringChainIntoView(TimeLineItemControl first, TimeLineItemControl last, int direction)
{
Double l1 = 0;
Double l2 = 0;
Double w = 0;
Double w2 = 0;
Double end = 0;
first.GetPlacementInfo(ref l1, ref w, ref end);
last.GetPlacementInfo(ref l2, ref w2, ref end);
Double chainW = end - l1;
Double leadBuffer = 4 * UnitSize;
chainW += leadBuffer;
if (direction > 0)
{
first.BringIntoView(new Rect(new Point(0, 0), new Point(chainW, Height)));
}
else
{
first.BringIntoView(new Rect(new Point(-leadBuffer, 0), new Point(chainW, Height)));
}
}
